Abstract
Fading is commonly used to describe the properties of the communication channel. Large efforts have been made to describe characteristics of the channel in wireless communication system. The performance of wireless signal propagation in a conventional environment needs Doppler fading channel schemes by assuming a perfect knowledge about the channel frequency response at both the transmitter and the receiver sides. Two models were used to depict the characteristics of Doppler fading channel in term of source velocity, where the first is free space transmission model consists of two antennas at a given distance (r) to calculate the received signal strength for transmission links at relative motion between the transmitter and receiver antennas. The second model is simulation based on Matlab (2013B) to compute and plot the received signal envelope taking into account the source velocity over the multipath fading. The analysis and employing the information of Doppler fading can enhance the characteristics of channel estimation. Key words: Doppler, fading, frequency, receiver, transmitter.
Highlights
The relative motion between the transmitter and receiver introduces Doppler shift
Two models were used to depict the characteristics of Doppler fading channel in term of source velocity, where the first is free space transmission model consists of two antennas at a given distance (r) to calculate the received signal strength for transmission links at relative motion between the transmitter and receiver antennas
The second model is simulation based on Matlab (2013B) to compute and plot the received signal envelope taking into account the source velocity over the multipath fading
Summary
The relative motion between the transmitter and receiver introduces Doppler shift. It affects the received signal frequency and causes frequency broadening. Fading can be defined as the fluctuations in received electromagnetic wave as a consequence of multipath signal components. Many different replicas of the received electromagnetic waves can be arrived to the receiving end. These replicas came from different paths and interference constructively or destructively according to their amplitude, phase and time delay
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